McLOUD, Okla. – The 25-year-old woman convicted of second-degree murder for pushing her husband to his death from the 25th floor of their apartment reportedly committed suicide in prison.

Officials say Amber Hilberling was pronounced dead at 5:33 p.m. Monday at the Mabel Bassett Correctional Center, where Hilberling had been serving a 25-year prison sentence for the 2011 death of her husband, Joshua Hilberling.

Tuesday evening, a preliminary autopsy revealed Hilberling’s cause of death was ruled asphyxial hanging and the manner of death was ruled a suicide.

Prosecutors alleged that Amber Hilberling shoved her husband through the window after they’d argued over splitting up.

Hilberling, who was 19 at the time and seven months pregnant, argued that the death was an accident caused by “unusually thin” windows in the couple’s apartment.

In 2013, she was sentenced to serve 25 years in prison.

Before her sentencing, she was offered a plea deal in which she would have only served 5 years in prison.

However, she declined the deal and ended up receiving a harsher sentence.

“It is with a heavy heart that I write this statement. Our sincere condolences go out to everyone who loved Amber. Had Amber accepted the generous sentence that was offered to you by the DA, she would’ve been home last year. Whether it was greed, or foolishness that caused her to not accept the deal . The deal would’ve prevented her from personally suing the apartment building owners? I regret that some people find it necessary to post negative comments on Joshua’s memory page, and send ugly private messages. It brings back memories of the pages and pages of derogatory lies posted for months after Josh’s death. We are reliving that day, the feelings and thoughts have returned, as if it had just happened. Josh was a good man. He was not perfect. He made many mistakes. But, he always asked for forgiveness and forgave others. He showed kindness to everyone. His life was taken before he could achieve his many goals. This is not a time to dig up hate and contempt. Joshua and Amber are gone from this earth forever. We are left with pain and memories. Our wish for Amber’s family is to try to remember the good times you had with Amber. Amber loved her father, Mike Fields and her Missouri family. We are praying for peace for everyone, including Josh’s family and friends. Both families have lost a child. There are no winners in either of these horrible events. It is tragic for everyone.”